Method and means for coating tubes internally



Jan. 4 1927..

c. M. NELSON METHOD AND MEANS FOR COATING TUBES INTERNALLY Filed July12, 1924 ,JZnZ.

Patented Jan. 4, 1927.

UNITED. STATES I v 1,613,119 PATENT OFFICE.

CLARENCE M. NELSON. OF SAN FRANCISCO. CALIFORNIA. ASSIGNOR TO NATIONALPAPER PRODUCTS COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OFCALIFORNIA.

METHOD'AND MEANS FOR COATING TUBES INTERNALLY."

Application filed July 12,

This invention relates to tube making 111achincs, and particularly to animproved method and means for internally coating paper tu es and thelike sin'iultancously with the manufacture thereof. Theprimary object ofmy invention'is to provide an improved method and means for performingthis operation.

Paper tubes are ordinarily manufactured by spirally rolling paper stockover a stationary forming mandrel; As the tube is formed the same isforced axially off the free end of the mandrel. My inventioncontemplates a method and means for coating the inner surface of thetube as the same passes off the mandrel. I preferably accomplish thiscoating operation by spraying the said internal surface as the tubeleaves the mandrel and spreading the spray equally over such surface bya rotating brush therein. It is, accordingly, a further object of myinventionto provide an improved method and means for so coating theinternal surface of a tube in connection with the manufacture of thetube by spirally winding paper stock on a forming mandrel.

\Vith the above and other objects in view, my invention consists in thefeatures of construction and operation set forth in the followingspecification and illustrated in the accompanying drawing. In suchdraw-.

ing annexed hereto and forming a part of this specification, I haveshown one specific form of my invention 1n connection with a'conventional type of tube forming machine, but it will be understoodthat the invention can be otherwise embodied and that the drawing is notto be construed asdefining or limiting the scope of the invention; theclaims appended to this specification being relied upon for thatpurpose.

Referring to the figures of the drawing: Fig. 1 is a front elevation ofa tube forming machine, showing my invention in connection therewith.

Fig. 2 is an enlarged cross sectional view, taken on line '22 of Fig. 1.

Fig. 3 shows a detail hereinafter described.

In Fig. 1 of the drawing I have illustrated my invention in connectionwith a paper tube making machine of conventional type. A mandrel 1. issupported atone end in a head 2, mounted on a supporting frame 7 1924.Serial No. 725.715.

3. The tube 1 is formed on this-mandrel to be rotated from acounter-shaft 8, through a belt 9, the rotation being controlled by a"friction clutch 10 and a hand lever 11. The pipe 7 is adapted to carrythe tube coating liquid and is provided with such liquid from areservoir 12in communication therewith through a pipe 13. The liquidflow is controlled by a valve 14 and the pipe is held secured to themachine by means of a stay 15. The pipes 7 and 13 are connected by apacking gland 16 which permits rotation of the pipe'7 relative to thepipe 13. The other end of the pipe 7 is perforated at 17 and carries afelt distributing brush 18 on its extreme outer end.

The operation of-the machine is as follows: As the belts 6 operate inthe direction shown by the arrows, the tube 4 is formed and forcedaxially off the free end of the mandrel. The valve 14 being open and theclutch 10 being closed, the pipe 7 is rotated in the direction oppositeto that of the tube 4 and the coating liquid from the reservoir 12 issprayed outwardly through the per.- forations 17. As the tube movesaxially in the direction of the arrow (Fig. 1), the sprayed-portion ofthe tubes comes into contact with the rotating brush 18 which spreadsthe liquid equally over the surface of the tube. The inner surface ofthe tube is, therefore, equally coated with the liquid as the same comesoff the mandrel. It will be understood that the thickness of suchcoating can be controlled by the valve 14 and by the thickness of theliquid. It should also be understood that the liquid is under pressurein the reservoir 12, whereby the same is sprayed from the perforationsl'l'as defined.

What I claim as new and desire to secure by Letters Patent is: r v 1. Atube coating device comprising the combination of a mandrel adapted tosup port a tube thereon, a pipe extending through the mandrel, and aliquid containm 1,e13,11e

ing reservoir in communication with one end of the pipe, the portion ofthe other end of the pipe extending beyond the mandrel being perforatedand disposed centrally of the mandrel to permit the flow of liquidtherefrom in a manner coating the inside of the tlube therearound as thesame leaves the manrel.

2. A tube coating device comprising the combination of a mandrel adaptedto support a tube thereon, a pipe extending through the mandrel andprojecting outwardly at the ends thereof, a liquid containing reservoirin communication with one end of the pipe, the other end of the pipebeing perforated to permit the flow of liquid therefrom, a brush on theend of the pipe adjacent to the said perforations, and means forrotating the pipe.

3. A tube making device comprising the combination of a mandrel, meanssupporting the mandrel at one end, a spirally arranged belt passingaround the mandrel and adapted to form a tube and feed the same axiallyofl the free end of the mandrel, a pipe extending through the mandreland projecting outwardly at the ends thereof, a liquid containingreservoir in communication with the end of the pipe adjacent to the saidmandrel supporting means, the other end of the pipe being perforated topermit the How of liquid therefrom, a brush on the end of the pipeadjacent to the said perforations, and means adjacent to the saidmandrel supporting means for rotating the pipe.

4. A tube coating device comprising the combination of a mandrel adaptedto support 'a. tube thereon, a pipe extending through the mandrel andprojecting outwardly at the ends thereof, a liquid containing reservoirat one end of the pipe, and a brush on the other end of the pipe, thepipe being perforated between the brush and mandrel whereby the coatingliquid is sprayed therefrom onto the inner surface of a formed tube asit leaves the mandrel and thereafter spread by the brush,

CLARENCE NELSON.

